Add strong warning before permanent item deletion (#5044)

[guillermo-escire]

References

Fixes #5044

Description

Adds a stronger confirmation dialog before permanently deleting an item, warning administrators about irreversible deletion and potential impact on citations and external references.

Instructions for Reviewers

This PR improves the deletion workflow for items by adding a stronger confirmation dialog before permanent deletion.

List of changes in this PR:

• Added a modal-based confirmation dialog before item deletion.
• Introduced new i18n translation keys for the deletion warning messages.
• Displayed a clear warning informing administrators that deletion is permanent and may break external references and scholarly citations.

How to test:

1. Log in as an administrator.
2. Navigate to any item and open the edit page.
3. Click the Delete action.
4. Verify that a confirmation modal appears with a strong warning message.
5. Confirm that deletion only proceeds after explicitly confirming in the dialog.

Checklist

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[alegontarz]

QA testing performed (no code review).

Works as expected:

1. The confirmation modal is displayed when clicking Delete.
2. The action buttons in the modal work correctly.

Does not work as expected:

1. The modal content is not translated according to the selected application language.

[tdonohue]

@alegontarz : Just for clarification. We do not require translations of every new PR. So, I'm going to consider your review as an "approval" that this PR is working. Translations always occur later (usually during Testathon) by translators.

[hostle83]

Hi @guillermo-escire, just tested this and everything looks great. Just one small suggestion: to maintain consistency, would it be possible to flip the buttons in the modal? Currently, the main screen presents "Delete" (left) and "Cancel" (right). The modal presents "Delete" (right) and "Cancel" (left). See screenshot.

[artlowel]

Thanks @guillermo-escire!

The code looks good, and it works.